c# - (最佳实践)FluentValidation 和检查重复实体

Question

我有一个包含 3 个主键的表(联结表)，所以当我想检查重复记录时，我必须同时检查 3 个属性

我写了一个这样的方法

    private bool IsDuplicate(long roleId, long componentGroupId, long operationId)
    {
        var business = new RoleGroupBusiness();
        var result = business.Where(x => x.RoleID == roleId && x.ComponentGroupID == componentGroupId && x.OperationID == operationId).Any();
        return result;
    }

我有一个像这样的 FluentValidator 类:

public class RoleGroupValidator : AbstractValidator<RoleGroup>
{

    private bool IsDuplicate(long roleId, long componentGroupId, long operationId)
    {
        var business = new RoleGroupBusiness();
        var result = business.Where(x => x.RoleID == roleId && x.ComponentGroupID == componentGroupId && x.OperationID == operationId).Any();
        return result;
    }
    public RoleGroupValidator()
    {
        RuleFor(x => x.RoleID).NotNull().WithMessage("A");
        RuleFor(x => x.ComponentGroupID).NotNull().WithMessage("A");
        RuleFor(x => x.OperationID).NotNull().WithMessage("A");    
    }

}

1) 如何在 FluentValidator 中使用 IsDuplicate 方法？

或

2) 在 fluentValidation 库中检查实体是否重复的最佳方法是什么？

RuleFor 只获取其中一个属性的值，但我需要所有属性的值才能传递给我的方法

Answer 1

你应该使用 Must 方法:

public class RoleGroupValidator : AbstractValidator<RoleGroup>
{
    public RoleGroupValidator()
    {
        RuleFor(x => x.RoleID).NotNull().WithMessage("A");
        RuleFor(x => x.ComponentGroupID).NotNull().WithMessage("A");
        RuleFor(x => x.OperationID).NotNull().WithMessage("A");
        RuleFor(x => x).Must(x => !IsDuplicate(x));
    }

    private bool IsDuplicate(RoleGroup r)
    {
        var business = new RoleGroupBusiness();
        return business.Any(x => x.RoleID == r.RoleID &&
                                 x.ComponentGroupID == r.ComponentGroupID &&
                                 x.OperationID == r.OperationID);
    }
}

如果 RoleGroupBusiness 实例是一次性的(可能是)，请不要忘记处理它:

private bool IsDuplicate(RoleGroup r)
{
    using (var business = new RoleGroupBusiness())
    {
        return business.Any(x => x.RoleID == r.RoleID &&
                             x.ComponentGroupID == r.ComponentGroupID &&
                             x.OperationID == r.OperationID);
    }
}